Resolve "add websitecarbon badge"

Closes #130 (closed)

src/theme/Footer/index.js

@@ -69,8 +69,8 @@ function Footer() {
           </div>
         </Link> 
       </div>
-      <div id="wcb" class="carbonbadge wcb-d"></div>
-<script src="https://unpkg.com/website-carbon-badges@1.1.3/b.min.js" defer></script>
+      <div id="wcb" className="carbonbadge wcb-d"></div>
+      <script src="https://unpkg.com/website-carbon-badges@1.1.3/b.min.js" defer></script>
 
     </>
   );